Double sealed differential pressure bailer



W. J. FLURY Sept. 15, 1936.

DOUBLE SEALED DIFFERENTIAL PRESSURE BAILER original Filed Aug. 2e, 1935Wfl/fm @ZF/wy v 33H56 L Patented Sept. 15, 1936 eine of andlfoncthird toLouis'nimahdoi both of. Long Benni-com.

- origini `implication Autum-v cs; 1935,-

. 37,794. Dividedand thisapplicatiom'Apr,

193s, Asoriol No. 73,298

s cioims.- (CL ies-isi g This invention has to do in a general way withoil well operations and is more-particularly related to a bailer of theso-called suction or diiierential pressure ltype, such as is describedand illustrated in my co-pending application,=Seri al No. 37,794,med-August 26, 1935, entitled4Di f-' ferential pressure bailer", and..of which-the .present application isa division.

As is well known tofthose familiar with the art, bailersof this; generaleharacterare extensively usedfor the purposefof removing sandend otherdbrisfromthe bottompf oi1-f Wells` and. embody a sand chamber and an airchamber separated by valve-mechanism adapted to; be forcefully.` openedagainstanfexcessive pressure in 'the sand chamber when theunit-engages-the bottom of the well;- 1.

telescoping members nwa acter, lwhich operatesindependently of any pak-It is-.one object ofthisinvention to-provide in a boiler' of the class'describedanfimproved-Yalvve mechanism which is openedimmediately-asgthe unit is collapsed butvwhich is .closed as soon as theunit is *extendedl and remains closedas long as the unit is in extendedposition.-v In; an arrangement of this character,` evenv though theassemblymay be 'inadvertently lowered into the well at a .velocityfgreatenough-.to momentarily collapse the unit when it strikes the liquid inthe well, itimmediately extends and closes the valve so that the only-.e!ect will beto slightlyincrease the pressure inthe. air chamberlabove atmosph'eric. Even with thelslight increase in Ipressure in theair chamber. which might be effected through this action, the-differencebetweenthe vpi-essure'in therair chamber andthe pressure at the bottomof the well is so great that it does not in anyrway impair .theoperation` of the unit when. it reachesthe bottomoi the A hoie. l

It is a'fprimery object of this invention to---provide improved sealingmeans-'between the two 'paiiei` i o- -ithis charsiidobiyattending aplanerepresented by the line 2-2, oi Fig. 1; Fig. 3 is a fragmentarysectional elevation similar to Fig. 2 showing the position ofthe partswhen ythe two telescopin'g'ele'ments are collapsed; s

isa plan .section taken alongthe line HOLES-gfx .-f More: particularlyQdescribing" he invention as herein illustratedreferenoe nume 1 1.', l,l' indicates wbliohfis'fmidbi-twetleSCQPm' tilbu- 1 .1841- v11,115 Llpcd {.gvQ-.nllly' PY .[fel'n. nu merels-i2 dhd13 'pmi 'lf2 1S'1?,lvidid.isofogiiivoot'ionai i ijoiigoopnf boinghp'rovided withering orlii'ikniber ,ielito whlche SSPen-l alle .l1 maybe, elle@ 15 Thebottomot ,thelwerhierber. 'I3 is ptlilfvided .with the conventional inlet anddischarce1-tsnoe reference' nmeralijl- :generally indic ateifv by I4which isshown asbeing provided 'witha bull nose l,The bottom oftheupper member- 'I Zjfisj 'ro- .vided wi'thabushing-oriitting 21 whichhasja ifeduced-hollow stem 28 on its lowerend such' stem downthroughastulngfbox A3@ -29 whichisiniounted in top biishineli ori the uppei`end-v otthe lower' member I S In 'this wey it willbe seen ,thatV intlfi'i s, for-m of 'invention becomes Wha@ meyufbe' "teiescopingviinit3g llas j ;I n the upper enc-*1 for.'thel otite: member.

i3 wonde en initieel? ing-'means topositiveiy seai-the-.airichamberiromform-.,of-.myinventiom togethenwithp-other ob .jectsottending-its-production,wili beobest under- .v j

stood' 'from theo-following: descrptinniof-theace ewesflshowiug apreferred-iembodimentzof my in'- so as to establish communicationbetween the interior of the member 28 and its associated upper member I2and the interior of the outer or lower member I3.

'Ihe bottom of the cage 33' is shown as being formed with or rigidlyconnected to a downwardly extending valve stem 36 which in turn supportsa valve member 31 at itslower end. The valve member 31 has an accuratelyground face 38 formed on itspupper edge which is adapted to engage withan inwardly extending shoulder 38 provided on the lower or outer memberbelow the region occupied by the port which in this form of my inventionis contained within the cage 33. In this form ot my invention the valveseat or shoulder 39 is shown as comprising the lower edge of a bushingmember 4I to which the main body tube o f the sand chamber or bottommember I3 is connected.

From the construction as described so far, it

will be seen that the valve member 31 when it is,

closed, divides the -assembly into what may b e termeda sand chamber inlthe lower portion of the member I3 and an air'chamber which includes aportion of the member I3 above the seat-39 and the member I2. In thisconnection it is an important feature of this-invention that thedistance between the upper shoulder 38 on the valve member and theshoulder 32 be such that both o i these members are engaged by thecorresponding shoulders 39 and 3I on the lower or outer member I3 whenthe unit is in extended position. In this way it will be seen thatwhenever the bailer is in suspended position the shoulders 38 and 39constitute a seal between the air chamber and the sand chamber and theshoulders 3l and 32 constitute a. positive pressure seal between the airchamber and the outer end portion of the passage in the outer or bottommember I3, which, when the bailer is in use serves to positively sealthe air chamber from the liquid in the well irrespective of the packing29 or any leakage which may have developed therein..

In assembling the units to obtain this positive sealing effect thehollow stem 28 is ilrst inserted into the lower member through thepacking box 29 after which the ring member is screwed on the stem and islocked in place by the cage 33 at the desired point. The two members arethen pulled into their fully extended position with the shoulders 3I and32 in tight pressure engagement, and a collet is placed around the upperportion of the stem 28 in pressure tting engagement with the upper edgeof the packing box bushing. Alter this has been done the valve member31`is screwed up on to the bottom of the valve stem 38 until it is intight pressure engagement with the seat or shoulder 38 and a lockingmember 45 is screwed on to the lower end of the valve stem below thevalve 31. In this way the two shoulders 32 and 38 are adjusted so thatthey have the same space relationship as the shoulders 3i and-38 on theouter or lower member. It will be observed that the lower member in thisform of my invention is supported by the shoulders 3I-32 and A38---38and that such shoulders constitute positive pressure seals'forming achamber in the upper end of the lower member which communicates throughthe port or ports in the cage with' the intericr of the air'chamber orupper member. The valve member 31 is equipped with an auxiliary by passvalve which is formed by providing the lower end oi the stem 38 with achamber 5I having ports Il in its upperend and provided with a seat i2at its lower end. The seat 52 is and an adapted to be engaged by a checkvalve 53 which is shown as being yieldably held in pressure engagementwith the seat by means of a coil spring 54 which in turn is supported ona spider 58 threaded intoa passage 51 formed through the locking member45. With this arrangement it This occurs when the valve 22 is openedafter the bailer has been illled so that the upper end of the member I2contains air under a substantial pressure.

Since it is not necessary nor desirable to have the enormous pressureencountered in the bottom of the hole within the air chamber when theunit is drawn to the surface of the ground, it is the practice toprovide in bailers of this general character, a pressure release valvesituated in the air chamber so as to relieve the pressure therein, asthe bailer is withdrawn, until such pressure 'reaches a predeterminedvalue. Such a pressure release valve is indicated by reference numeral68 and may be of any desired type being capable of'adjustment to retainwithinthe air chamber the desired pressure for unloading the bailer. v

It is to be understood that while I have herein described andillustrated one preferred form of my invention that the invention is notlimited to the precise construction described above, but includes withinits scope whatever changes fairly come within the spirit of the appendedclaims.4

I claim as my invention: 1. In a bailer, the combination of: an uppertube and a lower tube telescopically connected; a

cage on the bottom of said upper tube received said cage; a secondshoulder in the lower tubel above said cage; a shoulder on said uppertube above said cage adapted to engage the under surface of' said secondshoulder and form a seal when said valve member engages said ilrstmentioned shoulder; and an inwardly opening check valve in the bottom ofsaid lower tube.

2. .in a'bailer, the combination of: an upper tube and a lower tubetelescopically connected; a. cage on the bottom of said upper tubereceived in the upper end of said lower tube; in said lower tube belowsaid cage forming a valve seat; a valve member below said shoulderadapted to have seating engagement therewith; means rigidly connectingsaid valve member with said cage; a second shoulder in the lower tubeabove said cage; a shoulder on said upper tube above said'cage adaptedto engage the under surtace of said second shoulder and form a seal whensaid valve member engages said first mentioned shoulder; packing meansin said lower tube .above said second shoulder slidably engaging aportion oi said upper tube above said cage;

'opening check valve in the bottom of said lower-'tuba 3. In a bailerthe combination of: a lower tube member having an inwardly opening checkvalve in the bottom thereof; an upper tube member telescoping into thetop of said lower tube; a

downwardly facing shoulder in said lower tube.

in the upper end of said lower tube; a shoulder a shoulder forming avalve seat; a valve member secured to the bottom of said upper tube andadapted to be engaged by said seat, the bottom of said upper tube memberabove said valve being vported to provide communication betweenv saidupper and lower tubes when said valve member and said'l seat aredisengaged; and co-operative sealing shoulders on the upper and lowertubes respectively above said port adapted for inter-engagement whensaid valve is engaged by. said seat.

4, In a bailer the combination of a lower tube member having an inwardlyopening check valve in the bottom thereof; an upper tube membertelescoping into the top of said lower tube; a downwardly facingshoulder in said. lower tube forming a valve seat; a valve membersecured to the bottom of said upper tube and adapted to be engaged bysaid seat, the bottom of said spaced shoulders on one of said members;

upper tube member above said valve being ported to provide communicationbetween said upper and lower tubes; co-operative sealing shoulders onthe upper and lower tubes respectively above said port adapted forinter-engagement when said valve is engaged by said seat; and packingmeans in the top of the lower tube slidably engaging said upper tube.

5. In a bailer of the class described, the combination of twotelescoping tubular members, the

inner member having a port at its inner end communicating with the.interior of the outer member; means for limiting the collapsing movementof said members; and means comprising two sets of co-operating shouldersformed on said members both above and below said port land adapted to beengaged ,when said members are fully extended, for forming a sealedchamber in the outer member communicating with said port.

6. In a bailer; inner and outer telescoping members; an air chamber inone of said members; a sand chamber in the other member; spaced sealingmeans on the other member engaging said said seals being locatedshoulders position, the interior o! said members between said shouldersbeing in open communication when said members are in telescopedposition; and means for limiting the lrelative movement between saidmembers.

'7. In a well bailer, the combination oi: inner and outer telescopingmembers forming an air chamber and a sand chamber; on one of saidmembers; and spaced sealing means on the other member adapted to engagesaid shoulders to form seals, one ot said seals being located betweenthe sand chamber and the air chamber, the other seal being located-between the air chamber and the outer end portion of the passage in theouter member in which the inner member telescopes.

8. In a well bailer, the combination of: inner and outer telescopingmembers forming an air chamber and a sand chamber; spaced sealing meanson one of said members; and sealing means on the other member adapted toengage said first mentioned sealing means to form seals, one of betweenthe said sand chamber and the air chamber and the other seal beinglocated between the air chamber and the outer end portion of the passagein the outer member in which the inner member telescopes.

9. In a well bailer, the combination of: inner and outer,telescopingmembers forming an air chamber and a sand chamber, said inner memberhaving a port therein adapted to communicate with the interior of saidouter member when the members are in collapsed position; and sealingmeans on the respective members positioned to have ,simultaneousinter-engagement both above and below said port when said members are inextended position, said sealing means being said members are collapsed.l

spaced shoulders wnmAMJJLUnr. l'

when said members are in extended v adapted for simultaneousdisengagement when

